The initial setting time of hydraulic lime, is
30 minutes
60 minutes
90 minutes
120 minutes
Correct Answer :
D. 120 minutes
Related Questions
The most fire resistant paints are:
Enamel paints
Aluminium paints
Asbestos paints
Cement paints
The ultimate tensile strength of structural mild steel is about
160 N/mm²
260 N/mm²
420 N/mm²
520 N/mm²
Plastic
Is an organic substance
Consists of natural or synthetic binders
Finished products are rigid and stable at normal temperature
All the above
The size of modular bricks, is
10 × 10 × 9 cm
19 × 9 × 9 cm
22.5 × 10 × 8.5 cm
22.5 × 8.0 × 9 cm
The cement becomes unsound by the presence of excess
Sulphur
Magnesia
Lime
All of these
After storage, the strength of cement
Decreases
Increases
Remains same
May increase or decrease
In arches, stratified stones are placed so that their planes are
Parallel
Perpendicular
Radial
None of these
Cement paints usually
Contain hydrated lime
Contain 5% to 10% colour pigments
Contain 5% sodium chloride
All the above
Bitumen felt
Is used as water proofing material
Is used as damp proofing material
Is made from bitumen and hessian fibres
All the above
For testing compressive strength of cement, the size of cube used is
50 mm
70.6 mm
100 mm
150 mm
A ferrous metal is
Cast iron
Wrought iron
Steel
All the above
The PVC doors and windows are preferred as they are
Rust proof
Rot proof
Water proof
All of these
Which one of the following is an air binding material?
Gypsum
Acid-resistant cement
Quick lime
All of these
Rapid hardening cement contains
Tri-calcium silicate
Tri-calcium aluminate
Tetra-calcium alumino-ferrite
Di-calcium silicate
For slaking of 10 kg of CaO, the theoretical amount of water is
2.2 kg
1.5 kg
3.2 kg
None of these
Which of the following stresses is used for identifying the quality of structural steel?
Ultimate stress
Yield stress
Proof stress
None of the above
In paints, the pigment is responsible for
Durability
Colour
Smoothness
Glassy face
Kaolin is chemically classified as
Metamorphic rock
Argillaceous rock
Calcareous rock
Siliceous rock
The initial setting time of lime-pozzolana, is
30 minutes
60 minutes
90 minutes
120 minutes
The most commonly used synthetic abrasive is
Aluminium carbide
Boric acid
Silicon
All of these
Cast iron
Is obtained by purifying pig iron
Is manufactured in required shapes
May contain 2 to 5 per cent of carbon with other impurities
All the above
Jumper is a tool used for
Testing of stones
Quarrying of stones
Dressing of stones
None of the above
The rocks in which argil (or clay) predominates, are called
Siliceous rocks
Argillaceous rocks
Calcareous rocks
Igneous rocks
The most important constituent of an oil paint, is
Thinner
Vehicle
Pigment
All the above
Refractory bricks are
Neutral refractory bricks
Acid refractory bricks
Basic refractory bricks
All the above
A stone is rejected if it absorbs water more than
5 %
10 %
15 %
20 %
Quick lime is (i) Slow in setting (ii) Rapid in slacking (iii) Good in strength The correct answer is
Only (i)
Only (ii)
Both (i) and (ii)
Both (ii) and (iii)
Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth?
Lime stone and alumina
Silica and alkalies
Alumina and iron
Alkalies and magnesium
Bituminous fells are used for
Covering A.C. sheets
Covering sloping roofs
D.P.C.
None to these
The presence of original rounded surface on the manufactured piece of timber, is called
Wane
Torn grain
Diagonal grain
Chipmark